Motor and cooling fan with a circuit board having a heat-conducting insulator

Abstract

A motor includes a base, a stator, a rotor, a circuit board and a heat-conducting insulator. The base includes a cooling plate. The stator is coupled to the base. The rotor is rotatably coupled to the base and aligned with the stator. The circuit board is received in the base and electrically connected to the stator. The heat-conducting insulator is disposed between the cooling plate and the circuit board, and abuts with the cooling plate and one face of the circuit board.

What is claimed is: 
     
       1. A motor, comprising:
 a base including a cooling plate; 
 a stator coupled to the base; 
 a rotor rotatably coupled to the base and aligned with the stator; 
 a circuit board coupled to the base, having first and second faces and electrically connected to the stator; 
 a plurality of electronic components mounted on the first and second faces of the circuit board; 
 a heat-conducting insulator disposed between the cooling plate and the first face of the circuit board and between the cooling plate and the plurality of electronic components mounted on the first face of the circuit board, and respectively abutting with the cooling plate and one face of the circuit board, wherein the heat-conducting insulator is made of an insulation material selected from one of acrylic resin, silica gel and other composite material with silica gel and one of a ceramic powder and a metal powder; and 
 an auxiliary heat-conducting insulator disposed at the second face of the circuit board and extending over the plurality of electronic components mounted on the second face of the circuit board, wherein the auxiliary heat-conducting insulator is made of an insulation material selected from one of acrylic resin, silica gel and other composite material with silica gel; 
 wherein the stator includes an upper end and a lower end spaced from the upper end in a direction parallel to the rotor, with the stator further including a plurality of circumferentially spaced heat-conducting members each having one end extending beyond the lower end and through the circuit board to contact with the heat-conducting insulator and having another end extending to the upper end, with the plurality of the circumferentially spaced heat-conducting members extending parallel to the rotor. 
 
     
     
       2. The motor as claimed in  claim 1 , wherein the base further includes an assembling room and a compartment having an opening, the stator is received in the assembling room and the circuit board is disposed in the compartment, and the cooling plate is disposed at the opening of the compartment. 
     
     
       3. The motor as claimed in  claim 2 , wherein the compartment further includes a shoulder portion abutting with an outer periphery of the circuit board to form a first room between the cooling plate and the circuit board, and the heat-conducting insulator is received in the first room. 
     
     
       4. The motor as claimed in  claim 3 , wherein a second room is formed between the circuit board and a blocking wall of the compartment, an auxiliary heat-conducting insulator is received in the second room, and the auxiliary heat-conducting insulator has one face abutting with another face of the circuit board. 
     
     
       5. The motor as claimed in  claim 1 , wherein the base further includes a shaft tube disposed at a center of a top face of the cooling plate, the shaft tube has an axial hole and an outer periphery, the rotor is rotatably coupled with the axial hole, and the stator and the circuit board are coupled with the outer periphery of the shaft tube. 
     
     
       6. The motor as claimed in  claim 5 , wherein the heat-conducting insulator has a through-hole on a center thereof, the heat-conducting insulator is coupled with the shaft tube by coupling the through-hole with the outer periphery of the shaft tube, and the heat-conducting insulator is disposed between the cooling plate and the circuit board. 
     
     
       7. The motor as claimed in  claim 2 , wherein the stator includes a body and a plurality of coils, the body has a receiving hole, and the coils are coupled with the body and annularly arranged on an inner circumferential wall of the receiving hole. 
     
     
       8. The motor as claimed in  claim 7 , wherein the rotor includes a rotating member, a shaft and a permanent magnet, the shaft has one end coupling to a center of the rotating member and another end extending through the receiving hole of the body to rotatably couple to the base, and the permanent magnet is coupled to an outer peripheral face of the shaft and is aligned with the coils. 
     
     
       9. The motor as claimed in  claim 5 , wherein the stator includes a body and a plurality of coils, the body has a receiving hole, and the coils are coupled with the body while surrounding the receiving hole. 
     
     
       10. The motor as claimed in  claim 9 , wherein the rotor includes a rotating member, a shaft and a permanent magnet, the shaft has one end coupling to a center of the rotating member and another end extending through the receiving hole of the body to rotatably extend into the axial hole of the shaft tube, and the permanent magnet is coupled with an inner peripheral face of the rotating member while surrounding the coils. 
     
     
       11. A cooling fan including:
 a frame including an air inlet and an air outlet; 
 a base received in and connected to the frame via a plurality of connection members, wherein the base includes a cooling plate; 
 a stator coupled to the base; 
 a rotor rotatable coupled to the base and aligned with the stator, and including a plurality of vanes arranged on an outer periphery thereof, 
 a circuit board coupled to the base, having first and second faces and electrically connected to the stator; 
 a plurality of electronic components mounted on the first and second faces of the circuit board; 
 a heat-conducting insulator disposed between the cooling plate and the first face of the circuit board and between the cooling plate and the plurality of electronic components mounted on the first face of the circuit board, and respectively abutting with the cooling plate and the first face of the circuit board, wherein the heat-conducting insulator is made of an insulation material selected from one of acrylic resin, silica gel and other composite material with silica gel and one of a ceramic powder and a metal powder; and 
 an auxiliary heat-conducting insulator disposed at the second face of the circuit board and extending over the plurality of electronic components mounted on the second face of the circuit board, wherein the auxiliary heat-conducting insulator is made of an insulation material selected from one of acrylic resin, silica gel and other composite material with silica gel; 
 wherein the stator includes an upper end and a lower end spaced from the upper end in a direction parallel to the rotor, with the stator further including a plurality of circumferentially spaced heat-conducting members each having one end extending beyond the lower end and through the circuit board to contact with the heat-conducting insulator and having another end extending to the upper end, with the plurality of the circumferentially spaced heat-conducting members extending parallel to the rotor. 
 
     
     
       12. The cooling fan as claimed in  claim 11 , wherein the base further includes an assembling room and a compartment having an opening, the stator is received in the assembling room and the circuit board is disposed in the compartment, and the cooling plate is disposed at the opening of the compartment. 
     
     
       13. The cooling fan as claimed in  claim 12 , wherein the compartment further includes a shoulder portion abutting with an outer periphery of the circuit board to form a first room between the cooling plate and the circuit board, and the heat-conducting insulator is received in the first room. 
     
     
       14. The cooling fan as claimed in  claim 13 , wherein a second room is formed between the circuit board and a blocking wall of the compartment, the auxiliary heat-conducting insulator is received in the second room, and the auxiliary heat-conducting insulator has one face abutting with the second face of the circuit board. 
     
     
       15. The cooling fan as claimed in  claim 11 , wherein the base further includes a shaft tube disposed at a center of a top face of the cooling plate, the shaft tube has an axial hole and an outer periphery, the rotor is rotatably coupled with the axial hole, and the stator and the circuit board are coupled with the outer periphery of the shaft tube. 
     
     
       16. The cooling fan as claimed in  claim 15 , wherein the heat-conducting insulator has a through-hole on a center thereof, the heat-conducting insulator is coupled with the shaft tube by coupling the through-hole with the outer periphery of the shaft tube, and the heat-conducting insulator is disposed between the cooling plate and the circuit board.